content: /*******************************************************************************
   * Copyright 2011, 2012 Chris Banes.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *******************************************************************************/
  package com.handmark.pulltorefresh.library;
  
  import android.annotation.TargetApi;
  import android.content.Context;
  import android.os.Build.VERSION;
  import android.os.Build.VERSION_CODES;
  import android.util.AttributeSet;
  import android.view.View;
  import android.widget.ScrollView;
  
  public class PullToRefreshScrollView extends PullToRefreshBase<ScrollView> {
  
  	public PullToRefreshScrollView(Context context) {
  		super(context);
  	}
  
  	public PullToRefreshScrollView(Context context, AttributeSet attrs) {
  		super(context, attrs);
  	}
  
  	public PullToRefreshScrollView(Context context, Mode mode) {
  		super(context, mode);
  	}
  
  	public PullToRefreshScrollView(Context context, Mode mode, AnimationStyle style) {
  		super(context, mode, style);
  	}
  
  	@Override
  	public final Orientation getPullToRefreshScrollDirection() {
  		return Orientation.VERTICAL;
  	}
  
  	@Override
  	protected ScrollView createRefreshableView(Context context, AttributeSet attrs) {
  		ScrollView scrollView;
  		if (VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD) {
  			scrollView = new InternalScrollViewSDK9(context, attrs);
  		} else {
  			scrollView = new ScrollView(context, attrs);
  		}
  
  		scrollView.setId(R.id.scrollview);
  		return scrollView;
  	}
  
  	@Override
  	protected boolean isReadyForPullStart() {
  		return mRefreshableView.getScrollY() == 0;
  	}
  
  	@Override
  	protected boolean isReadyForPullEnd() {
  		View scrollViewChild = mRefreshableView.getChildAt(0);
  		if (null != scrollViewChild) {
  			return mRefreshableView.getScrollY() >= (scrollViewChild.getHeight() - getHeight());
  		}
  		return false;
  	}
  
  	@TargetApi(9)
  	final class InternalScrollViewSDK9 extends ScrollView {
  
  		public InternalScrollViewSDK9(Context context, AttributeSet attrs) {
  			super(context, attrs);
  		}
  
  		@Override
  		protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX,
  				int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
  
  			final boolean returnValue = super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
  					scrollRangeY, maxOverScrollX, maxOverScrollY, isTouchEvent);
  
  			// Does all of the hard work...
  			OverscrollHelper.overScrollBy(PullToRefreshScrollView.this, deltaX, scrollX, deltaY, scrollY,
  					getScrollRange(), isTouchEvent);
  
  			return returnValue;
  		}
  
  		/**
  		 * Taken from the AOSP ScrollView source
  		 */
  		private int getScrollRange() {
  			int scrollRange = 0;
  			if (getChildCount() > 0) {
  				View child = getChildAt(0);
  				scrollRange = Math.max(0, child.getHeight() - (getHeight() - getPaddingBottom() - getPaddingTop()));
  			}
  			return scrollRange;
  		}
  	}
  }
  